<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="$router.back()"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>

          <!-- $event 可以用来接收子组件传过来的值 -->
          <!-- 可以简化 使用 v-model

          ---------
          v-model=article.is_followed
          传递: props:
            :isfollowed="article.is_followed"
          修改: 自定义事件
            @upDataFollow="article.is_followed = $event"

            props: :value='article.is_followed'
            修改: @input= "article.is_followed = $event"
          -->
          <FollowUser
            :followUserid="article.aut_id"
            v-model="article.is_followed"
          ></FollowUser>

          <!-- <van-button
            v-if="article.is_followed"
            class="follow-btn"
            round
            size="small"
            @click="onFollow"
            :loading="followLoading"
            >已关注</van-button
          >
          <van-button
            @click="onFollow"
            v-else
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            :loading="followLoading"
            >关注</van-button> -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          v-html="article.content"
          ref="article-cintent"
        ></div>
        <van-divider>正文结束</van-divider>
        <CommentList
          @reply-click="onPlayClick"
          :list="commentList"
          :source="article.art_id"
          @commentCounts="totalCommentCount = $event"
        ></CommentList>

        <!-- 发表评论 -->
        <van-popup v-model="isPostShow" position="bottom">
          <CommentPost
            @onsuccess-post="onSuccessPost"
            :target="article.art_id"
          ></CommentPost>
        </van-popup>
        <!-- 发表评论 -->

        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            @click="isPostShow = true"
            class="comment-btn"
            type="default"
            round
            size="small"
            >写评论</van-button
          >
          <van-icon name="comment-o" :info="totalCommentCount" color="#777" />
          <!-- <van-icon color="#777" name="star-o" /> -->
          <CollectArticle
            v-model="article.is_collected"
            :articleId="article.art_id"
          ></CollectArticle>
          <van-icon color="#777" name="good-job-o" />
          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="errStatus">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticleDetail"
          >点击重试</van-button
        >
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 回复弹出层 -->
    <van-popup v-model="isReplyShow" position="bottom" style="height: 100%">
      <CommentReply
        v-if="isReplyShow"
        @close-reply="isReplyShow = false"
        :comment="currentComment"
      ></CommentReply>
    </van-popup>
  </div>
</template>

<script>
import { getArticleDetail } from '@/api/article'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user'
import CollectArticle from '@/components/collect-article'
import CommentList from './components/comment-list.vue'
import CommentPost from './components/comment-post.vue'
import CommentReply from './components/comment-reply.vue'

export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    CollectArticle,
    CommentList,
    CommentPost,
    CommentReply
  },
  props: {
    // 使用props获取动态路由的数据
    articleId: {
      type: [Number, String],
      required: true
    }
  },
  provide: function () {
    return {
      articleId: this.articleId
    }
  },
  data () {
    return {
      article: {},
      loading: true, // 加载中的状态
      errStatus: 0, // 存储失败状态码
      totalCommentCount: 0, // 评论数
      isPostShow: false, // 控制评论弹出层
      commentList: [],
      isReplyShow: false, // 回复评论的弹出层
      currentComment: null // 存储当前评论的对象
    }
  },
  computed: {},
  watch: {},
  created () {
    this.loadArticleDetail()
  },
  mounted () {},
  methods: {
    async loadArticleDetail () {
      this.loading = true
      try {
        if (Math.random() > 0.6) {
          throw new Error('错误')
        }
        const res = await getArticleDetail(this.articleId)
        res.data.data.content = res.data.data.content.replaceAll(
          'https://images.weserv.nl/?url=',
          ''
        )
        console.log(res)
        this.article = res.data.data
        // 因为dom更新数据是异步的 所以可以使用定时器
        setTimeout(() => {
          this.previewImage()
        }, 0)
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errStatus = 404
          this.$toast('访问的文章资源不存在')
        } else {
          this.$toast('访问的文章详情失败')
        }
      }
      this.loading = false
    },

    // 处理文章中图片预览
    previewImage () {
      // 从文章获取到所有 img DOM 节点
      const articleContent = this.$refs['article-cintent']
      const imgs = articleContent.querySelectorAll('img')
      // 获取文章内容中所有的图片地址
      const images = []
      imgs.forEach((img, ind) => {
        images.push(img.src)
        // 遍历所有节点 给每个节点注册点击事件
        img.onclick = () => {
          ImagePreview({
            images: images,
            // 指定预览图片的起始位置
            startPosition: ind
          })
        }
      })
    },

    // 关闭评论弹出层
    onSuccessPost (comment) {
      this.isPostShow = false
      this.commentList.unshift(comment.new_obj)
    },

    // 回复
    onPlayClick (comment) {
      console.log(comment)
      this.currentComment = comment
      this.isReplyShow = true
    }
  }
}
</script>

<style scoped lang="less">
@import "./github-markdown.css";
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
